document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=209297>Question 209297</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The resistance of a wire varies directly with its length and inversely with the square of its diameter. If 100 feet of wire with diameter 0.01 inch has a resistance of 80 ohms, what is the resistance of 90 feet of the same type of wire if its diameter is 0.04 inch?\r<BR>\n" );
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document.write( "HELP!!! I dont know what to do! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #158225 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=158225\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> From  statements  about  direct  and  indirect variation,,,<BR>\n" );
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document.write( "R=k (L/d^2),,,where,,R= resistance(ohms),,,L=Length(ft),,,d=diameter(in)<BR>\n" );
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document.write( "and  k is  a  constant  of  variation.\r<BR>\n" );
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document.write( "From  example  given,,,R=k (100/.01^2) =80,,,or  k=.00008<BR>\n" );
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document.write( "Question  is,,,R = k (90/.04^2)= .00008 (90/.04^2) = 4.5  ohms<BR>\n" );
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